Abstract
Anatase phase TiO2 nanoparticles were synthesized by sol–gel method using titanium(IV) butoxide as a starting material. The pH of solution was maintained by adding HNO3 and NaOH. The obtained powder was heat-treated at 350 °C for 2 h. The XRD study shows that the crystalline size and crystallinity of samples increase with pH of solution. Raman spectra confirm the dominance of anatase phase of TiO2. Morphology study of samples was done by scanning electron microscope (SEM). The size of prepared samples was calculated by XRD and confirmed by TEM analysis. The energy bandgap was calculated by optical absorption spectra and it was found to decrease by increasing pH of the solution. The photodegradation activity of Indigo Carmine (IC) dye under visible light irradiation was carried out by synthesized TiO2 nanoparticles. The removal of Indigo Carmine dye and degree of mineralization after photodegradation were studied using HPLC and TOC analysis respectively.
Highlights
In present days, the wastewater from industries found colorful liquid/dye which contains aromatic rings, metallic and halide ions; which are toxic to human health as well as aquatic life[1]
There are several metal oxide nanoparticles used as a photocatalyst because of their different physical and chemical properties better than bulk materials[5]
Due to small size motion of charge carriers is controlled by quantum confinement[6].Large surface area of nanoparticles is useful in making interaction between material and medium
Summary
The wastewater from industries found colorful liquid/dye which contains aromatic rings, metallic and halide ions; which are toxic to human health as well as aquatic life[1]. Such toxic water from industries is directly sent to the nearby rivers, ponds, lakes which reduces the quality of water[2]. TiO2 is synthesized by several methods like sol-gel,hydrothermal, CVD, microwave, ball milling, etc[9,10,11,12].Among all these methods sol-gel process is the most interesting and easy method It requires low temperature, easy process, high degree of purity and homogeneity. Photoluminescence spectra (PL) was recorded using JASCO FP-8200 spectrofluorometer
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